¿Qué propiedades tiene un buen lubricante?

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¿Qué propiedades tiene un buen lubricante?

Propiedades lubricantes:

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Importancia de los sistemas de lubricación y refrigeración en un motor.

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1. Viscosidad:

La viscosidad es una medida de la resistencia al flujo o la fricción interna del lubricante.
-generalmente medido con Saybolt Universal Seconds (SUS) y viscosímetro Redwood. También se expresa en centistoke (unidad de viscosidad cinemática) y centipoise (unidad de viscosidad absoluta).
-expresado en dos temperaturas, a saber -18 °C (0 °F) y 99 °C (210 °F)

2. Índice de viscosidad:

Se utiliza para clasificar lubricantes. La viscosidad es inversamente proporcional a la temperatura.
-A medida que aumenta la temperatura, la viscosidad del lubricante disminuye y a medida que aumenta la temperatura. disminuye, la viscosidad del lubricante aumenta.
-El cambio en la viscosidad del aceite con los cambios de temperatura se mide mediante el índice de viscosidad.
-El aceite a medir se compara con dos aceites de referencia de la misma viscosidad a 99 °C. uno de ellos es un aceite base parafínico con índice de cero y otro aceite base nafténico tiene un índice de 100.
– Un número de índice de viscosidad alto indica un cambio relativamente pequeño en la viscosidad del aceite con la temperatura.
-Se recomienda aceite de baja viscosidad para motores de automóviles en invierno y no en verano. La viscosidad de un lubricante debe ser suficiente para garantizar la lubricación. Si está por encima de este valor, la pérdida de potencia es mayor debido a la mayor resistencia del aceite.
-Se añaden mejoradores del VI para mejorar el índice de viscosidad.

3. Untuosidad:

Es propiedad de un aceite lubricante extenderse sobre las superficies de rodamiento, adherirse firmemente a ellas y proporcionar lubricidad. En general, la untuosidad del aceite lubricante debe ser alta, especialmente cuando se utiliza para superficies de contacto sujetas a alta intensidad de presión y áreas de espacio más pequeñas, para evitar que el aceite se salga. Esto protege el metal con una fina capa de aceite y reduce significativamente el desgaste. Se mide por el coeficiente de fricción en condiciones extremas de funcionamiento.

4. Punto de inflamación:

El punto de inflamación del aceite es la temperatura mínima a la que los vapores del aceite lubricante se inflaman cuando se pasa una pequeña llama sobre la superficie. Hay dos tipos con punto de inflamación abierto y punto de inflamación cerrado. El punto de inflamación del aceite lubricante debe ser superior a la temperatura. ocurrir en los almacenes para evitar la posibilidad de riesgo de incendio.

Propiedades de un buen lubricante

¿Qué propiedades tiene un buen lubricante?
Propiedades de un buen lubricante

5. Punto de incendio:

Si el aceite lubricante se calienta más después de alcanzar el punto de inflamación, la temperatura más baja alcanzará la temperatura más alta. El punto focal en el que el aceite arde continuamente durante 5 segundos se llama punto focal.
– Normalmente es 11°C superior al punto de inflamación abierto y varía entre 190°C y 290°C para los lubricantes utilizados en motores de combustión interna. -El punto de combustión de un lubricante también debe ser alto para que el aceite no se queme durante el funcionamiento.

6. Punto de nube:

Es la temperatura. en el que el aceite lubricante cambia su estado de líquido a sólido. Su temperatura. debe ser alto para la baja temperatura. Funcionalidad del aceite lubricante en invierno.

7. Punto de fluidez:

Es la temperatura más baja. en el que el aceite lubricante no fluye o forma completamente cera o se solidifica. Esta característica debe considerarse debido a su impacto en el arranque de un motor en climas fríos. El petróleo producido a partir de crudos parafínicos tiende a tener puntos de fluidez más altos que los producidos a partir de crudos nafténicos. Los puntos de fluidez se pueden reducir agregando un depresor del punto de fluidez, generalmente un fenol o éster polimerizado. El punto de fluidez debe ser al menos 15 °F por debajo de la temperatura de funcionamiento para garantizar la máxima circulación.

8. Corrosividad:

La presencia de ácidos (ácido mineral, ácido de petróleo) es perjudicial para las superficies metálicas. El aceite lubricante no debe atacar químicamente los materiales del motor. El lubricante no debe ser corrosivo pero debe proteger contra la corrosión. El aceite nuevo tiene un número de neutralización bajo, lo que significa que retiene la solución alcalina y ácida para hacer que el aceite sea neutro.

9. Estabilidad a la oxidación:

Es resistente a la oxidación. Debido a la oxidación, el aceite se deposita en los segmentos del pistón y pierde sus propiedades lubricantes. Operar a bajas temperaturas, evitar el contacto con áreas calientes y ventilar el cárter puede ayudar a mantener la estabilidad del aceite durante períodos prolongados. Los inhibidores de la oxidación se utilizan para mejorar la estabilidad de la oxidación. Se trata de compuestos complejos formados por azufre y fósforo o derivados de aminas y fenoles.

10. Limpieza:

El aceite lubricante debe estar limpio. No debe contener polvo ni partículas de suciedad ni agua que provoquen corrosión.

11. Residuos de carbono:

Después de vaporizar una gran muestra de aceite lubricante bajo ciertas condiciones, pueden quedar residuos carbonosos. Indica las propiedades del yacimiento de petróleo. El aceite de parafina tiene mayores residuos de carbono que el aceite base nafténico.

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Write a seo optimized article for a blog. Get inspired by the following content, (adsbygoogle = window.adsbygoogle || []).push({}); (adsbygoogle = window.adsbygoogle || []).push({});What are the properties of Good LubricantProperties of Lubricant: (adsbygoogle = window.adsbygoogle || []).push({}); (adsbygoogle = window.adsbygoogle || []).push({});Read More : Importance of Lubrication and Cooling Systems in an Engine (adsbygoogle = window.adsbygoogle || []).push({});What is Lubrication System | Function of lubrication (adsbygoogle = window.adsbygoogle || []).push({}); 1. Viscosity: Viscosity is a measure of the resistance to flow or the internal friction of the lubricant. -usually measured by Saybolt universal seconds (SUS) and Redwood viscometer. Also it is expressed with centistoke (unit of kinematic viscosity) and centipoise (unit of absolute viscosity) -expressed in two temperature i.e. -18ᵒC (0ᵒF) and 99ᵒC (210ᵒF) (adsbygoogle = window.adsbygoogle || []).push({}); 2. Viscosity Index: It is used to grade lubricants. Viscosity is inversely proportional to temp. -If temp. increases, the viscosity of the lubricant decreases and if temp. decreases, the viscosity of the lubricant increases. -The variation of viscosity of oil with changes in temperature is measured by viscosity index -oil to measure is compared with 2 reference oil having same viscosity at 99ᵒC. one is paraffinic base oil index of zero and another naphthenic base oil index of 100 -high viscosity index number indicates relatively smaller change in viscosity of the oil with temperature. -low viscos oil is recommended for automobile engines in winter than summer. The viscosity of a lubricant should be just sufficient to ensure lubrication. If it is more than this value, power loss will be higher due to increased oil resistance. -VI improver are added to improve viscosity index3. Oiliness: It is the property of a lubricating oil to spread & attach itself firmly to the bearing surfaces as well as provide lubricity. Generally, the oiliness of the lubricating oil should be high particularly when it is to be used for mating surfaces subjected to a high intensity of pressure and smaller clearance portion to avoid the squeezing out of the oil. Such a way that the metal is protected by a thin layer of the oil and the wear is also considerably reduced. It is measured by co-efficient of friction at extreme operating condition.4. Flash Point: Flash point of oil is the min. temp. at which the vapours of lubricating oil will flash when a small flame is passed across its surface. It is of two type open flash point and closed flash point. The flash point of the lubricating oil must be higher than the temp. likely to be developed in the bearings in order to avoid the possibility of fire hazards.Characteristics of Good Lubricantcharacteristics of good lubricant5. Fire Point: If the lubricating oil is further heated after the flash point has been reached, the lowest temp. at which the oil will burn continuously for 5 seconds is called fire point. -usually 11ᵒC higher than open flash point and varies from 190ᵒC to 290ᵒC for the lubricants used for IC engines -The fire point of a lubricant also must be high so that the oil does not burn in service.6. Cloud Point: It is the temp. at which the lubricating oil changes its state from liquid to solid. Its temp. must high for the low temp. operability of the lubricating oil during winter.7. Pour Point: It is the lowest temp. at which the lubricating oil will not flow or totally form wax or solidify. This property must be considered because of its effect on starting an engine in cold weather. Oil derived from paraffinic crudes tends to have higher pour points than those derived from naphthenic crudes. The pour points can be lower by the addition of pour point depressant usually a polymerised phenol or ester. Pour point must be at least 15ᵒF lower than the operating temperature to ensure maximum circulation.8. Corrosiveness: The present of acid (mineral acid, petroleum acid) is harmful to the metal surfaces. The lubrication oil should not attack chemically the materials of the engine. The lubricant should not be corrosive, but it should give protection against corrosion. New oil has low neutralisation number i.e. it maintains the alkaline and acid solution to make the oil neutral.9. Oxidation stability: It is resistance to oxidation. Due to oxidation the oil will form deposits on the piston rings and lose its lubricating property. Low temperature operation avoiding the hot-area contact and crankcase ventilation can help in preserving the stability of oil over longer periods. Oxidation inhibitors are used to improve oxidation stability. These are complex compounds of sulphur and phosphorus or amine and phenol derivatives.10. Cleanliness: Lubricating oil must be clean. It should not contain dust and dirt particles as well as water content which promote corrosion.11. Carbon residue: after evaporation of a mass sample of lubricating oil under specific condition may remain as carbonaceous residue. It indicates the deposit characteristics of oil. Paraffinic oil has higher carbon residues than the naphthenic base oil. (adsbygoogle = window.adsbygoogle || []).push({}); (adsbygoogle = window.adsbygoogle || []).push({}); Related posts: What are the Properties Of Fluid | Learnmech What is Lubrication System | Function of lubrication What are the purposes, properties and types of cutting fluids? 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}(document, «script», «twitter-wjs»)); {«@context»:»http:\/\/schema.org\/»,»@type»:»BlogPosting»,»name»:»What are the properties of Good Lubricant»,»url»:»https:\/\/learnmech.com\/what-are-the-properties-of-good-lubricant\/»,»articleBody»:»What are the properties of Good Lubricant\r\nProperties of Lubricant:\r\n\r\nRead More :\u00a0\r\n\r\nImportance of Lubrication and Cooling Systems in an Engine\r\n\r\nWhat is Lubrication System | Function of lubrication\r\n\r\n1. Viscosity: \r\n\r\nViscosity is a measure of the resistance to flow or the internal friction of the lubricant.\r\n-usually measured by Saybolt universal seconds (SUS) and Redwood viscometer. Also it is expressed with centistoke (unit of kinematic viscosity) and centipoise (unit of absolute viscosity)\r\n-expressed in two temperature i.e. -18\u1d52C (0\u1d52F) and 99\u1d52C (210\u1d52F)\r\n\r\n2. Viscosity Index:\r\n\r\n It is used to grade lubricants. Viscosity is inversely proportional to temp.\r\n-If temp. increases, the viscosity of the lubricant decreases and if temp. decreases, the viscosity of the lubricant increases.\r\n-The variation of viscosity of oil with changes in temperature is measured by viscosity index\r\n-oil to measure is compared with 2 reference oil having same viscosity at 99\u1d52C. one is paraffinic base oil index of zero and another naphthenic base oil index of 100\r\n-high viscosity index number indicates relatively smaller change in viscosity of the oil with temperature.\r\n-low viscos oil is recommended for automobile engines in winter than summer. The viscosity of a lubricant should be just sufficient to ensure lubrication. If it is more than this value, power loss will be higher due to increased oil resistance.\r\n-VI improver are added to improve viscosity index\r\n\r\n3. Oiliness: \r\n\r\nIt is the property of a lubricating oil to spread & attach itself firmly to the bearing surfaces as well as provide lubricity. Generally, the oiliness of the lubricating oil should be high particularly when it is to be used for mating surfaces subjected to a high intensity of pressure and smaller clearance portion to avoid the squeezing out of the oil. Such a way that the metal is protected by a thin layer of the oil and the wear is also considerably reduced. It is measured by co-efficient of friction at extreme operating condition.\r\n\r\n4. Flash Point: \r\n\r\nFlash point of oil is the min. temp. at which the vapours of lubricating oil will flash when a small flame is passed across its surface. It is of two type open flash point and closed flash point. The flash point of the lubricating oil must be higher than the temp. likely to be developed in the bearings in order to avoid the possibility of fire hazards.\r\n\r\nCharacteristics of Good Lubricant\r\n\r\ncharacteristics of good lubricant\r\n\r\n5. Fire Point: \r\n\r\nIf the lubricating oil is further heated after the flash point has been reached, the lowest temp. at which the oil will burn continuously for 5 seconds is called fire point.\r\n-usually 11\u1d52C higher than open flash point and varies from 190\u1d52C to 290\u1d52C for the lubricants used for IC engines -The fire point of a lubricant also must be high so that the oil does not burn in service.\r\n\r\n6. Cloud Point:\r\n\r\n It is the temp. at which the lubricating oil changes its state from liquid to solid. Its temp. must high for the low temp. operability of the lubricating oil during winter.\r\n\r\n7. Pour Point: \r\n\r\nIt is the lowest temp. at which the lubricating oil will not flow or totally form wax or solidify. This property must be considered because of its effect on starting an engine in cold weather. Oil derived from paraffinic crudes tends to have higher pour points than those derived from naphthenic crudes. The pour points can be lower by the addition of pour point depressant usually a polymerised phenol or ester. Pour point must be at least 15\u1d52F lower than the operating temperature to ensure maximum circulation.\r\n\r\n8. Corrosiveness:\r\n\r\n The present of acid (mineral acid, petroleum acid) is harmful to the metal surfaces. The lubrication oil should not attack chemically the materials of the engine. The lubricant should not be corrosive, but it should give protection against corrosion. New oil has low neutralisation number i.e. it maintains the alkaline and acid solution to make the oil neutral.\r\n\r\n9. Oxidation stability: \r\n\r\nIt is resistance to oxidation. Due to oxidation the oil will form deposits on the piston rings and lose its lubricating property. Low temperature operation avoiding the hot-area contact and crankcase ventilation can help in preserving the stability of oil over longer periods. Oxidation inhibitors are used to improve oxidation stability. These are complex compounds of sulphur and phosphorus or amine and phenol derivatives.\r\n\r\n10. Cleanliness: \r\n\r\nLubricating oil must be clean. It should not contain dust and dirt particles as well as water content which promote corrosion.\r\n\r\n11. Carbon residue: \r\n\r\nafter evaporation of a mass sample of lubricating oil under specific condition may remain as carbonaceous residue. It indicates the deposit characteristics of oil. Paraffinic oil has higher carbon residues than the naphthenic base oil.»,»headline»:»What are the properties of Good Lubricant»,»author»:{«@type»:»Person»,»name»:»Sachin Thorat»,»url»:»https:\/\/learnmech.com\/»},»datePublished»:»2019-03-13″,»mainEntityOfPage»:»True»,»dateModified»:»February 22, 2020″,»image»:{«@type»:»ImageObject»,»url»:»https:\/\/learnmech.com\/wp-content\/uploads\/2019\/03\/characteristics-of-good-lubricant.jpg»,»height»:535,»width»:572},»publisher»:{«@context»:»http:\/\/schema.org\/»,»@type»:»Organization»,»name»:»Learn Mechanical Engineering»,»logo»:{«@type»:»ImageObject»,»url»:»https:\/\/learnmech.com\/wp-content\/uploads\/2020\/01\/learn-mech-logo-1-300×300.png»,»height»:600,»width»:60}}} Sachin ThoratSachin is a B-TECH graduate in Mechanical Engineering from a reputed Engineering college. Currently, he is working in the sheet metal industry as a designer. Additionally, he has interested in Product Design, Animation, and Project design. He also likes to write articles related to the mechanical engineering field and tries to motivate other mechanical engineering students by his innovative project ideas, design, models and videos. One thought on “What are the properties of Good Lubricant” Shashika Sandaruwan says: October 12, 2021 at 11:38 amThank you very much for your research and Article about mechanical related subjects Wish you all the best Keep it up Best wishesReplyLeave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment *Name * Email * Save my name and email in this browser for the next time I comment. Δdocument.getElementById( «ak_js_1» ).setAttribute( «value», ( new Date() ).getTime() );This site uses Akismet to reduce spam. Learn how your comment data is processed. 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